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  <title>Pump data into an active hashing context from a file</title>

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</div><hr /><div id="function.hash-update-file" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">hash_update_file</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.1.2, PECL hash &gt;= 1.1)</p><p class="refpurpose"><span class="refname">hash_update_file</span> &mdash; <span class="dc-title">Pump data into an active hashing context from a file</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.hash-update-file-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>hash_update_file</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$hcontext</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
   [, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$scontext</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
  ] )</div>


 </div>

 <div class="refsect1 parameters" id="refsect1-function.hash-update-file-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">hcontext</code></em></dt>

     <dd>

      <p class="para">
       Hashing context returned by <span class="function"><a href="function.hash-init.html" class="function">hash_init()</a></span>.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">filename</code></em></dt>

     <dd>

      <p class="para">
       URL describing location of file to be hashed; Supports fopen wrappers.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">scontext</code></em></dt>

     <dd>

      <p class="para">
       Stream context as returned by <span class="function"><a href="function.stream-context-create.html" class="function">stream_context_create()</a></span>.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.hash-update-file-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.hash-update-file-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.hash-init.html" class="function" rel="rdfs-seeAlso">hash_init()</a> - Initialize an incremental hashing context</span></li>
    <li class="member"><span class="function"><a href="function.hash-update.html" class="function" rel="rdfs-seeAlso">hash_update()</a> - Pump data into an active hashing context</span></li>
    <li class="member"><span class="function"><a href="function.hash-update-stream.html" class="function" rel="rdfs-seeAlso">hash_update_stream()</a> - Pump data into an active hashing context from an open stream</span></li>
    <li class="member"><span class="function"><a href="function.hash-final.html" class="function" rel="rdfs-seeAlso">hash_final()</a> - Finalize an incremental hash and return resulting digest</span></li>
    <li class="member"><span class="function"><a href="function.hash.html" class="function" rel="rdfs-seeAlso">hash()</a> - Generate a hash value (message digest)</span></li>
    <li class="member"><span class="function"><a href="function.hash-file.html" class="function" rel="rdfs-seeAlso">hash_file()</a> - Generate a hash value using the contents of a given file</span></li>
   </ul>
  </p>
 </div>


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